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TEA1097
Information as of 2000-08-19
TEA1097; Speech and loudspeaker amplifier IC with auxiliary inputs/outputs and analog multiplexer
The TEA1097 is an analog bipolar circuit dedicated for telephone applications. It includes a line interface, handset microphone and
earpiece amplifiers, base microphone and loudspeaker amplifiers, some specific auxiliary Inputs/Outputs (I/Os) and an analog multiplexer
to enable the right transmit and/or receive channels. The multiplexer is controlled by a logic circuitry decoding four logic inputs provided by
a microcontroller. Twelve different application modes have been defined and can be accessed by selecting the right logic inputs.
This IC can be supplied by the line and/or by the mains if available (in a cordless telephone or a telephone answering machine for
example). It provides a 3.35 V supply for a microcontroller or dialler and a 2 V filtered voltage supply for electret microphones. The IC is
designed to facilitate the use of the loudspeaker amplifier during ringing phase.
Line interface
l
Low DC line voltage
l
Voltage regulator with adjustable DC voltage
l
Symmetrical high-impedance inputs (70 k
) for dynamic, magnetic or electric microphones
l
Dual Tone Multi-Frequency (DTMF) input with confidence tone on earphone and/or loudspeaker
l
Receive amplifier for dynamic, magnetic or piezo-electric earpieces (with externally adjustable gain)
l
Automatic Gain Control (AGC) for true line loss compensation.
Supplies
l
Provides a strong 3.35 V regulated supply for microcontroller or dialler
l
Provides filtered power supply, optimized according line current and compatible with external voltage or current sources
l
Filtered 2 V power supply output for electret microphone
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